Stack-connection for hot-blast stoves



(Novodel.)

H. KENNEDY.

STACK CONNECTION FOR- HOT BLAST STOVES.

Patented Sept. 6,1887.

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N PETERS. Phulcfu-mognpmr. wnnngfan. D4 C.

NiTnn STATES TnnT Tricem HUGH KENNEDY, OF SHAB PSBURG, PENNSYLVANIA.

SPECIFICATION forming part of Letters P Application tiled January 10, i837.

To all whom, t may concern:

Be it known that I, HUGH KENNEDY, of Sharpsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvementin Stack-Connections for Hot-Blast Stoves; and I do hereby declare the following to be a full, clear, and exact description thereof.

Great dilhculty has heretofore been experienced in the use ofthe valves which control the stack-flue of hot-blast stoves. Then a stove is on gas,77 the heated gases passing over the valve on their Way to the stack heat the valve and the stackdlue up to a very high temperature, so that it is necessary, in order to preserve the valve and its seat, to provide them With Watercooling devices 5 but this provision does not prevent the valve and its seat from becoming Warped by the great extremes of temperatures through which the various changes in the currents of the stove cause them to pass. The result is, the valve is seldom tight, and the leakage is constantly increasing as the period of its use lengthens. Avery serious evil arising from this leakincss of the valve is experienced when the stove is on air, i because the pressure of the blast forces the air through the leaky valve into the stackdlue and destroys or injuriously affects the draft in the other stoves which are connected with the same stack. There are always several stoves connected with a single stack, and as the air is under pressure and the Wasted heat is not, the draft through the leaky valve is sufticient in many instances to make a serious defect in the operations of the stoves which are on gas77 and connected With the same stack.

My invention is designed to obviate these difficulties, and its principal advantages are that it enables me to dispense with a stackflue valve and completely prevents any interference on the part of a stove on air with the stoves which are on gas."

To enable those skilled in the art to make and use my invention, I will now describe it With reference to the accompanying drawings, in which* Figure l is a vertical sectional view illustrating the simple form of my improvement. Fig. 2 is a vertical section of :myimprovement atent No. 369,342, dated September 6, 1887.

Serial No4 223.51m.

(No model.)

a side elevation of a of the staclciiue.

Like letters of reference indicate like parts.

In the drawings, c indicates the side of the hot-blast stove containing the opening I), which leads to the stack-liuc, and c is the pipe or flue which connects the opening I) with the stackiue d. The opening b is faced With a suitable casting, c, which may have a ground-seat, c', for receiving the beveled end of the pipe c. The pipe c is composed of a fixed or stationary section, c', anda moving or telescoping section or end, e, which is capable of being moved back and forth in the fixed section e bymeans of handles c", so as to connector disconnect the pipe c With the opening Z).

The stove is provided with a sliding door or lid, f, for closing the opening b when the pipe c is disconnected therefrom, and this door f, when the pipe c is connected with the opening I), may be fastened out ofthe Way by means of the hook g engaging with the staplef; or, if desired, the door may slide laterally or be removable. This, however, is an immaterial matter of construction, as any form of device which will close the opening I) tightly when the stove is on air and the pipe c is discouneeted is all that is necessary.

XVhcn the pipe c is connected with the stove, it may be fastened by means of straps 7i, hinged to the side of the stove and engaging with lugs i, to which they are secured by keys 7c, pass ing through the straps and bearing against the lugs, as shown by the broken lines in Fig. 2 and by full lines in Fig. 3. Wvhen the pipe e is disconnected, the end of the section ci may be closed bya suitable cap, m, which is secured thereto by straps a and keys n', the purpose of Which is to prevent a current of cold air from being drawn into the stack-line Vthrough the open end of the pipe c. Any other suitable device for closing the end of the pipe c when disconnected from the stove may be used. For instance, in Figs. 2 and 3 I show the applieation of my improvement to the stove already fitted With a valve, o. As ordinarily constructed, the presence of this valve does no harm. It acts as Well to close the pipe c when disconnected from. the stove as any other form of cap, and, being there, it is not necessary to portion of' the stove and as applied to the existing stove, and Fig. 3 is remove it.

, opening b closed, and

Thus constructed, the operation of `my improvement is as follows: When astove is on gas,77 the pipe c is connected with the opening b, as shown in Fig. 2 of the drawings, and the gas passes through the opening b and pipe c to the stackilue in the usual way. When it is desired to reverse the stove, the fastening devices are loosed, the telescoping end of the pipe c is drawn back, so as to completely disconnect it from the stove, the door f is lowered so as to close the opening b, and the pipe c is closed by means of the cap m., valve o, or other suitable closing device.

It is apparent that there is no danger of the air from the stove blowing into the staclcue d when the pipe c is disconnected and the if the opening b does leak by reason of the door f not fitting closely, no harm is done, except that a small portion of the blast is wasted. It is also apparent that, as the air (the blast) cannot obtain access to the pipe c, suitable device for closing the pipe c will answer in lieu thereof. Thus I am enabled by my invention to take away one of the most fruitful causes of irregularity in the action of these stoves, and to dispense with one of. the most troublesome and expensive'features in connection therewith.

I do not limit myself to the particular form of deviceshown and described for connecting and disconnecting the stove and stack-due, be cause it will be apparent to the skilled mechanic thatthe pipe c may be hinged and swing no valve is necessary, and that any laterally, or that a portion of the same may be capable of entire disconnection from the other parts. When it is desirable to close the stove, such disconnected part may be lifted oil' and laid to one side.

Other obvious modifications may be suggested, all of which involve the principle of complete separation between the stove and stack-flue whenever desired.

It is apparent that the fixed part of the pipe c may be connected with the stove and the movable part in connection with the stack-due. This arrangement, which wouldbe merely turning my invention around, is not, however, so good as the arrangement illustrated in the drawings.

I do not limit my invention to hot-blast stoves, but include, also, other combustionchambers which require a valve between the chamber and the stack.

Vhat I claim as my invention, and desire to secure by Letters Patent, is

The combination of the hot-blast stove with a stack-flue and an intermediate connectionpipe capable of being detached from the stove or due, substantially as and for the purposes 6o described.

In testimony whereof I have hereunto set my hand this 6th day of January, A. D. 1887.

HU GH KENNEDY.

Vitnesses:

R. H. WHITTLEsnY, Tnoivnls W. BAKEWELL. 

